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vyos 1.3 beta fails to configure Xen HVM guest ethernet interfaces due to ethtool -g error
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fresh vyos 1.3 beta instance installed from vyos-1.3-beta-202102220443-amd64.iso, as a Xen HVM guest.

set interfaces ethernet eth0 address


set interfaces ethernet eth0 address dhcp

.. both result in an error like this:

[ interfaces ethernet eth0 ]
VyOS had an issue completing a command.

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Report Time:      2021-02-22 18:57:51
Image Version:    VyOS 1.3-beta-202102220443
Release Train:    equuleus

Built by:
Built on:         Mon 22 Feb 2021 04:43 UTC
Build UUID:       6b8d42c3-efc5-4b34-925e-30bb8edd4262
Build Commit ID:  f4be339392a75b

Architecture:     x86_64
Boot via:         installed image
System type:      Xen HVM guest

Hardware vendor:  Xen
Hardware model:   HVM domU
Hardware S/N:     97826e4f-bd93-42b1-8602-aad21d637ad3
Hardware UUID:    97826e4f-bd93-42b1-8602-aad21d637ad3

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/", line 150, in <module>
  File "/usr/libexec/vyos/conf_mode/", line 91, in verify
    ethtool = Ethtool(ifname)
  File "/usr/lib/python3/dist-packages/vyos/", line 53, in __init__
    tmp = cmd(f'ethtool -g {ifname}')
  File "/usr/lib/python3/dist-packages/vyos/", line 179, in cmd
    raise OSError(code, feedback)
OSError: [Errno 76] failed to run command: ethtool -g eth0
returned: Ring parameters for eth0:
exit code: 76

cmd 'ethtool -g eth0'
returned (out):
Ring parameters for eth0:
returned (err):
Cannot get device ring settings: Operation not supported

[[interfaces ethernet eth0]] failed
Commit failed

and indeed.. the following does not seem to work:

$ sudo ethtool -g eth0
Ring parameters for eth0:
Cannot get device ring settings: Operation not supported

eth0 is a xen-netfront ethernet interface in a Xen HVM guest:

$ sudo ethtool -i eth0
driver: vif
bus-info: vif-0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no


Difficulty level
Unknown (require assessment)
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)

Event Timeline

pasik created this object in space S1 VyOS Public.
pasik updated the task description. (Show Details)

If I disable Xen PV drivers using "xen_platform_pci=0" from the host/dom0 side, and thus I get emulated e1000 NICs in the Xen HVM guest, then setting address to ethernet interfaces works ok..

$ sudo ethtool -i eth0
driver: e1000
version: 7.3.21-k8-NAPI
bus-info: 0000:00:03.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no

$ sudo ethtool -g eth0
Ring parameters for eth0:
Pre-set maximums:
RX:             4096
RX Mini:        0
RX Jumbo:       0
TX:             4096
Current hardware settings:
RX:             256
RX Mini:        0
RX Jumbo:       0
TX:             256

so yeah, for some reason "ethtool -g" does not work with the xen_netfront PV driver, and thus vyos ethernet interface configuration currently breaks due to that..

It seems the same problem (lack of "ethtool -g" support) happens also with "veth" interfaces.. ref T2516

This should have been fixed in the latest 1.3 beta - please try again

@c-po confirmed, works OK in vyos-1.3-beta-202102250443-amd64.iso. Thanks a lot!